A really cool plot twist could be that there is another character who has known all along that England is secretly a girl. And this character has been protecting her secret for their own reasons, perhaps because they have a special connection or ulterior motives that are slowly revealed as the story progresses.
One interesting plot twist could be when other characters start to notice her more 'feminine' behaviors despite her attempts to hide it. For example, she might accidentally show a preference for more traditionally female - oriented tasks or hobbies.
France might be the most likely. He is often depicted as perceptive and has a long - standing relationship with England. His understanding of nuances in behavior and character could lead him to suspect something is off and eventually discover the secret.
One idea could be a story about Baby England and Scotland's first encounter with a magical creature in their land. It could be a fairy that leads them on an adventure through the ancient forests. Another plot could involve them trying to create their own little kingdom together, with England being more focused on building forts and Scotland being in charge of finding food sources. And a third idea might be that they get lost in a mysterious fog and have to rely on each other to find their way back home.
One interesting plot idea could be Scotland taking on the role of a protective older brother figure. He could be teaching baby England about their shared heritage, like the unique landscapes and traditions. For example, showing him the ancient castles and explaining the stories behind them.
A great plotline could be England turning into a girl and then trying to prove that she is still as capable as before. She could participate in a series of challenges or competitions among the nations, like a cooking competition. Since she has a long history of certain culinary traditions, she wants to show that her gender change doesn't affect her skills. Meanwhile, her relationships with her old rivals like Spain could also take on a new dimension. They might be more hesitant to be as aggressive in their rivalries as they were before.
Well, one possible plot twist could be that Natsu has been hiding her true gender to be able to participate in male - dominated activities like a certain guild or sport. Another could be that she's in love with a male character, but is afraid to reveal her gender in case it changes how he feels. Or perhaps she has a special power that is related to her being a girl secretly, like a unique form of magic that only female dragonslayers can possess.
One possible plot twist could be that Zoro's gender is revealed at a crucial moment, causing shock among the other characters. For example, during a battle when an enemy discovers this secret and uses it to try and throw the team off balance.
One idea could be Prussia as a girl trying to break into the typically male - dominated military world in the Hetalia universe. She could face challenges and prejudices but also prove herself to be just as capable as the male characters.
Maybe Ichigo is secretly a girl because she's on a secret mission. In the fanfiction, she could be a spy or an undercover agent. Her guise as a boy has allowed her to infiltrate certain groups or places. When her true identity as a girl is discovered, it throws the whole mission into chaos, and she has to find a way to salvage it while dealing with the personal relationships that are affected.
One interesting plot twist could be that Inuyasha, as a girl, has a unique power that only female demons possess. This power might attract different types of enemies and allies. For example, she could have the ability to communicate with ancient female spirits that hold the secrets to defeating a powerful new foe. Another twist could be in her relationships. Instead of the typical male - led romances, she could be the one pursued by multiple suitors, both human and demon, which would change the dynamics of the story completely.
In some of these fanfictions, a great plot twist is when Hermione gets cursed and Draco has to find a way to break it. During this process, they learn more about each other's true selves. Also, it could be that Draco is under the influence of a dark spell that makes him act against Hermione, but she believes in the good in him and tries to break the spell, which deepens their bond in a very unexpected way.